PSD : What makes a logo look good.

A logo needs to be unique, it has to be something original and something people will be happy to wear or use. Logos can be very basic though, for example "Nike" is just a white tick, but it is very effective because its very stylish on T-shirts etc..
Some other brand's logo's use different text styles, for example "KoolAid" which has a 3D effect, Castrol which has italic text and and oreo which has a highlighted text background.